1. State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, P.R. China
2. Key Laboratory of Pathogen Biology of Jiangsu Province, Nanjing Medical University, Nanjing, P.R. China
3. Department of Microbiology, Nanjing Medical University, Nanjing 210029, P.R. China
4. Department of Physiology, Xuzhou Medical College, Xuzhou, Jiangsu 221004, P.R. China
5. Medical School, Quzhou College of Technology, Quzhou 324000, P.R. China
6. Department of Obstetrics, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, P.R. China
7. Cancer Virology Program, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15232, USA
8. Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA